You are having a "battle" of who's in charge! I am willing to bet that you are a very "controlling" personality. (as you should be to an extent because this is your home and business) BUT, so is she. I had a Mother just like this once, you will not win with her. Isnt she the one that is leaving soon? Dont even put up a fight, thats what she wants anyway, just give her everything she asks for and she will have no reason to get upset. Sounds like she wants controvercy, and REMEMBER? I told you, she is going to pick you apart for the next few weeks, watchinf everything you do and looking for mistakes, dont be surprised if she uses it against you in the end!!! Have a funny feeling things wont end well with this one...just give in and let her "think" she has control. It's a done deal, shes a psycho, and theres nothing you can do about it!
It may not even be about the clothes, its more her trying to point out to you, "that she is in control", just let her be, and be glad when they are gone! They are leaving right?